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Southern Beaufort Sea Stock POLAR BEAR (Ursus maritimus): Southern Beaufort Sea Stock STOCK DEFINITION AND GEOGRAPHIC RANGE Polar bears are found throughout the circumpolar arctic and occur in 19 subpopulations (http://pbsg.npolar.no/en/status/; Obbard et al. 2010), also known as stocks (Figure 1). Polar bear ranges are extensive and individual activity areas can be large (up to 167,000 km2) (Garner et al. 1990, Amstrup et al. 2000). Six polar bear stocks have ranges extending into two or more countries (Amstrup et al. 1986, Amstrup and Demaster 1988, Obbard et al. 2010). Two polar bear stocks occur in Alaska, the Southern Beaufort Sea (SBS) and the Chukchi/Bering Seas (CBS) stocks (Figure 1). Together, the two stocks range throughout the Beaufort and Chukchi Seas, including the nearshore habitats. The stocks overlap seasonally in the eastern Chukchi and western Beaufort Seas. The SBS stock is managed by the United States and Canada and is also referred to as the Southern Beaufort Sea subpopulation when described by the International Union for Conservation of Nature, Polar Bear Specialists Group (IUCN- PBSG; Aars et al. 2006). The distinction between the SBS and CBS stocks was originally determined by: (a) movement information collected from capture-recapture studies of adult female bears (Lentfer 1983); (b) physical oceanographic features that segregate stocks (Lentfer 1974); (c) morphological characteristics (Manning 1971; Lentfer 1974; Wilson 1976); and (d) variations in 1 levels of heavy metal contaminants of organ tissues (Lentfer 1976, Lentfer and Galster 1987). An extensive area of overlap between the Southern Beaufort Sea stock and the Chukchi/Bering seas stock occurs between Point Barrow and Point Hope, centered near Point Lay (Garner et al. 1990, Garner et al. 1994, Amstrup 2000, Amstrup et al. 2000, 2001a, 2002, 2004, 2005). Telemetry data indicates that adult female polar bears marked in the Southern Beaufort Sea spend about 25% of their time in the northeastern Chukchi Sea, whereas females captured in the Chukchi Sea spend only 6% of their time in the Southern Beaufort Sea (Amstrup 1995). Despite their overlap in ranges (Figure 2) and uncertainty in the exact delineation, the existence of two stocks is further supported by more recent information on contaminants (Evans 2004a, b; Kannan et al. 2007), movement data from satellite-linked collars (Garner et al. 1994, Amstrup et al. 2004, 2005), and population responses to sea ice loss (Rode et al. 2014). Additionally, very few bears in the CBS stock are observed denning within the range of the SBS stock (Rode et al. 2015), and similarly, very few bears in the SBS stock are observed denning in the range of the CBS stock (Durner et al. 2010). Contaminants Mercury (Hg), selenium (Se), and cadmium (Cd) concentrations in polar bear liver and kidney tissues were significantly higher in the SBS stock than in the CBS (Evans 2004a, Kannan et al. 2007, Routti et al. 2011), while the concentration of vanadium (V) in kidney tissue was higher in the CBS stock than in the SBS (Evans 2004a). In addition, Kannan et al. (2007) reported concentrations of trace elements of silver (Ag), bismuth (Bi), barium (Ba), copper (Cu), and tin 2 (Sn) were significantly higher in the CBS stock than the SBS stock. In a separate study, Evans (2004b) analyzed the persistence of organochlorine (OC) contaminants, including polychlorinated biphenyls (PCB) congeners; dichlorodiphenyltrichloroethane (DDT) and its metabolites, including dichlorodiphenyldichloroethylene (DDE); and chlordane-related compounds (CHL) in polar bears from both stocks. While concentrations of OCs in the SBS and CBS stocks were relatively low compared to other polar bear stocks, concentrations of OCs were higher in the SBS than in the CBS stock. Dietz et al. (2015) also found that concentrations of organohalogen contaminants exceeded a toxic effect threshold for bears in Alaska, although the levels found there were the lowest of the stocks considered. Similarly, McKinney et al. (2011) found that polar bears in Alaska tended to have higher levels of DDT contamination than other regions. Genetics Several modern studies have investigated the genetics of polar bears throughout their range. Analysis of mitochondrial DNA and microsatellite DNA loci indicates little differentiation between the SBS and CBS polar bear stocks (Cronin et al. 1991, 2006, Scribner et al. 1997). Using 16 variable microsatellite loci, Paetkau et al. (1999) observed small differences in genetic distances between the SBS stock and CBS stock; however, a lack of dramatic genetic variation led researchers to conclude that polar bears belong to a single evolutionary significant unit. More recently Peacock et al. (2015) and Malenfant et al. (2016) characterized genetic structure of polar bears subpopulations into large clusters. Peacock et al. (2015) identified four clusters, and Malenfant et al. (2016) identified six clusters, with the SBS and CBS occupying the same cluster in 3 both studies. While genetically similar, demographic and movement data indicate a degree of site fidelity, suggesting that the stocks should be managed separately, while recognizing that delineation of the CBS and SBS stocks includes a region of overlap (Amstrup 2000, Amstrup et al. 2000, 2001, 2002, 2004, 2005). Distribution The SBS polar bear stock is distributed predominantly throughout the central Beaufort Sea region. The western edge of their range is near Icy Cape, although the exact boundary between the SBS and the CBS stocks is uncertain. Amstrup et al. (2000) reported that the eastern boundary of the Southern Beaufort Sea stock occurred south of Banks Island and east of the Baillie Islands, Canada. However, analysis of polar bear movements using satellite telemetry from 2000 to 2006 (Amstrup et al. 2004, 2005), capture-recapture data (Regehr et al. 2006, Stirling et al. 2007), and harvest information suggest the eastern boundary for the SBS stock may be more appropriately located further west, near the village of Tuktoyaktuk, Canada. Responses to Changing Sea Ice Conditions In response to changes in sea ice characteristics and declines in sea ice habitat over the continental shelf during the summer and late autumn (Stroeve et al. 2014), some polar bears of the SBS stock have shifted their ranges to search for seals on ice and to access the remains of subsistence-harvested bowhead whales on land (Schliebe et al. 2008, Atwood et al. 2015a). Changes in distribution and movements, including increased land use during the summer, are expected to occur with increasing frequency in the future (Durner et al. 2009, Amstrup et al. 4 2007, Schliebe et al. 2008, Atwood et al. 2015a) and could lead to greater levels of human-polar bear conflict. Changing sea ice conditions have also led to more frequent observations of long- distance swims by polar bears in the SBS stock with the potential for significant energetic costs and impacts to survival (Durner et al. 2011, Pagano et al. 2012). In addition, polar bears from the SBS stock have historically denned on both the sea ice and land, but thinning of sea ice in recent years may have contributed to a decline in the proportion of polar bears denning on the sea ice. Fischbach et al. (2007) found that the proportion of dens on the pack ice declined from 62% during the period from 1985 to 1994 to 37% during the period from 1998 to 2004. Currently, the primary terrestrial denning areas for the SBS stock in Alaska occur on the barrier islands from Barrow to Kaktovik, and along coastal areas up to 25 miles inland, including the Arctic National Wildlife Refuge to Peard Bay, west of Barrow (Amstrup and Gardner 1994, Amstrup 2000, Durner et al. 2001, 2006, 2013). Polar bears are generally expected to experience nutritional stress as loss of Arctic sea ice continues (e.g., Stirling and Parkinson 2006, Amstrup et al. 2010, Rode et al. 2010). In some regions ice loss has apparently led to negative demographic effects (Regehr et al. 2007, 2010, Bromaghin et al. 2015), while in other regions polar bear subpopulations appear stable or increasing (Stirling et al. 2011, Peacock et al. 2013, Rode et al. 2014). In a recent study, Rode et al. (2014) found that SBS stock bears were responding differently to changing sea ice conditions compared to bears in the CBS stock. During the period from 2008 to 2011, bears inhabiting the Chukchi Sea were in better condition, larger, and appeared to have higher reproductive rates than bears inhabiting the southern Beaufort Sea (Rode et al. 2014). 5 In another study investigating climate effects on bears, Hunter et al. (2010) used the relationships between sea ice and polar bear vital rates estimated during the period from 2001 to 2006 to project the long-term status of the SBS stock under sea ice conditions as forecast by global climate models. The projection suggested there could be a high probability of significant population decline in the 21st century for the SBS stock. More recently, Bromaghin et al. (2015) analyzed demographic data from 2001 to 2010, and found similar evidence to Regehr et al. (2010) for expected low survival of all sex and age classes of polar bears in the mid-2000s. However, Bromaghin et al. (2015) also found survival of most sex and age classes of polar bears in the SBS stock increased during the period from 2007 to 2010, despite continued declines in the availability of sea ice. POPULATION SIZE Polar bears occur on sea ice at low densities throughout much of their range (DeMaster and Stirling 1981). Accurate estimates of abundance for the SBS stock have been difficult to obtain because of low population densities, inaccessibility of habitat, movement of bears across management and international boundaries, and budget limitations (Amstrup and DeMaster 1988, Garner et al. 1992). Research on the SBS stock began in 1967 and is one of only four polar bear subpopulations with long term (greater than 20 years) data.
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